وَيُسْتَحَبُّ لِمَنْ لَمْ يَجِدِ الْمَاءَ، وَهُوَ يَرْجُو أَنْ يَجِدَهُ فِي آخِرِ الْوَقْتِ: أَنْ يُؤَخِّرَ الصَّلَاةَ إِلَى آخِرِ الْوَقْتِ. فَإِنْ وَجَدَ الْمَاءَ تَوَضَّأَ وَصَلَّى، وَإِلَّا تَيَمَّمَ.
Meaning: One who cannot find water but hopes to obtain it near the end of the prayer time is recommended to defer the prayer to the end. If water is found, perform wudu and pray; otherwise, perform tayammum.
This postponement is recommended, not itself an obligation, and must not cause the prayer to be missed.